Microsoft 365 login problem on latest Canary 27842

Update:

I looked at the problem from two levels.

Generally, from the Microsoft 365 application level, e.g. when I launch Word, I get stuck on the inability to log in to this service. Trying to launch, for example, any Word file ends with a prompt to log in/no activation and generating the messages that I published in the 1st entry.

However, the situation is different when I launch Microsoft 365 Copilot. First of all, in this application I am logged in to the Office service, there is no prompt to log in (!!!). Secondly, I can create new Word files in it and work on them. Similarly, I can open and work with files in which I am indicated as the owner by name and surname. But when I try to open a file where I am not indicated as the owner, an error window pops up which I post with the following content: "This content is a potential security problem. Do you trust this content?"

When I click OK, this prompt pops up again, but at the same time there is information about a problem with connection 2604 and a login request, which still fails.

So If you look at screenshot below, I can open and work with any file where I'm a owner (owner - you/właściciel - Ty) but got problem with all files without this mark.